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Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature

A technology of low-temperature sintering and porous ceramics, which is applied in ceramic products, applications, household appliances, etc., to achieve the effects of improving high-temperature mechanical properties, improving oxidation resistance, and good mechanical strength

Active Publication Date: 2016-05-04
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this alleviates its further oxidation at high temperature to a certain extent, the SiO 2 The existence of silicon carbide ceramics is still an important factor for the failure of silicon carbide ceramics for long-term use at high temperatures

Method used

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  • Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature
  • Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature
  • Preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0025] First, the Al 2 (SO 4 ) 3 、Na 2 SO 4 and B 2 o 3 The raw materials are compounded according to the molar ratio of 1:4:1 / 6, and the mixture A is obtained through a 120-mesh sieve after mixing and ball milling; then, the mixture A, SiC powder, and carbon powder are mixed in a mass ratio of 8:100 : The ratio of 20 is carried out batching, crosses 120 mesh sieves and obtains mixture B after mixing ball milling; Adopting dry pressing method is that 200Mpa is at pressure, and pressure-holding time is that under the pressing condition of 120s, above-mentioned mixture B is pressed into green body; Then After drying it, place it in an electric furnace, and heat it up to 900°C at a rate of 5°C / min for calcination. After reaching the calcination temperature, it is kept for 3 hours, and then cooled with the furnace; finally, the sample is heated at 80°C. Ultrasonic cleaning with tap water under certain conditions, until the Na in the liquid after cleaning + The content does ...

Embodiment 2

[0028] First, the Al 2 (SO 4 ) 3 、Na 2 SO 4 and B 2 o 3 The raw materials are compounded according to the molar ratio of 1:4:1 / 6, and mixed with ball milling and passed through a 120-mesh sieve to obtain the mixture A; then, the mixture A, SiC powder and graphite powder are mixed in a mass ratio of 10:100 : The ratio of 100 is carried out batching, crosses 120 mesh sieves and obtains mixture B after mixing ball milling; Adopting dry pressing method is that 200Mpa is at pressure, and under the pressing condition that holding time is 90s, above-mentioned mixture B is pressed into green body; Then After drying it, place it in an electric furnace, and heat it up to 1000°C at a rate of 3°C / min for calcination. After reaching the calcination temperature, it is kept for 5 hours, and then cooled with the furnace; finally, the sample is heated at 80°C. Ultrasonic cleaning with tap water under certain conditions, until the Na in the liquid after cleaning + The content does not ex...

Embodiment 3

[0031] First, the Al 2 (SO 4 ) 3 、Na 2 SO 4 and B 2 o 3The raw materials are compounded according to the molar ratio of 1:4:1 / 6, and the mixed material A is obtained by passing through a 120-mesh sieve after mixing and ball milling; then, the mixed material A is mixed with SiC powder and graphite powder in a mass ratio of 2:100 : 0 ratio is carried out batching, crosses 120 mesh sieves and obtains mixture B after mixing ball milling; Adopt dry pressing method to be 150Mpa at pressure, under the pressing condition that holding pressure time is 60s, above-mentioned mixture B is pressed into green body; Then again After drying it, place it in an electric furnace, and heat it up to 1200°C at a rate of 8°C / min for calcination. After reaching the calcination temperature, keep it warm for 5 hours, and then cool it with the furnace; finally, the sample is heated at 80°C. Ultrasonic cleaning with tap water under certain conditions, until the Na in the liquid after cleaning + The...

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Abstract

The invention discloses a preparation method for mullite in-situ reinforced silicon carbide porous ceramic sintered at low temperature. The preparation method comprises the following steps: subjecting Al2(SO4)3, Na2SO4 and B2O3 to mixing and ball milling so as to obtain a mixture A; then subjecting the mixture A, SiC powder and a pore forming agent to mixing and ball milling so as to obtain a mixture B; subjecting the mixture B to compression molding and then carrying out drying and calcining; and successively carrying out ultrasonic cleaning and drying on the calcined sample. The method promotes low-temperature sintering of silicon carbide porous ceramic; the method overcomes defects in usage of the silicon carbide porous ceramic at high temperature in the presence of a high-temperature binder or sintering agent and is favorable for further improving the porosity of the silicon carbide porous ceramic; and more importantly, SiO2 produced on the surface of silicon carbide due to oxidation is converted into a mullite crystal phase through a high temperature reaction, so the high-temperature mechanical properties and antioxidation performance of the silicon carbide porous ceramic are further improved.

Description

technical field [0001] The invention relates to the technical field of preparation of porous ceramics, in particular to a method for preparing low-temperature sintered mullite in-situ reinforced silicon carbide porous ceramics. Background technique [0002] Due to its high porosity, good corrosion resistance and high temperature resistance, excellent thermal conductivity and other advantages, silicon carbide porous ceramics have been widely used in high temperature soot filtration, molten metal removal of impurities, catalyst carriers and other fields in recent years. Over the years, scholars from various countries have carried out a lot of research work on the preparation and modification of silicon carbide porous ceramics, and achieved fruitful results. Nevertheless, SiC porous ceramics currently suffer from two major problems. [0003] On the one hand, how to sinter silicon carbide powder at a lower temperature is a major problem it faces. Since silicon carbide is a str...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/06
CPCC04B35/565C04B38/068C04B2235/3201C04B2235/3217C04B2235/3409C04B2235/448C04B2235/77C04B2235/80C04B2235/96C04B38/067C04B38/0645C04B38/0074C04B38/0067
Inventor 邓义群沈针
Owner JIANGXI UNIV OF SCI & TECH
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